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Route Reliability

Washington → Las Vegas

IAD–LAS · 2,065 miles · Washington Dulles International Airport to Harry Reid International Airport

91
Nerd Approved
WanderNerd Reliability Score
85%
Arrive within 15 minutes
2 min early
Average arrival delay
0.4%
Cancelled
1,129
Flights in the data

Data through May 2026.

Airlines on this route

  • United Airlines86% on time · 1,035 flights
  • Frontier Airlines71% on time · 94 flights

Too little history on this route to call a winner. We rank airlines only after 100 flights each.

What the data says

Morning-you made the right choice.

IAD–LAS flights departing between 9 AM–12 PM arrived on time 93% of the time, versus 59% between 3–6 PM.

Sunday scaries are real for this one.

IAD–LAS flights arrived on time 90% of the time on Wednesdays. On Sundays: 81%.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon81%(167 flights)
  • Tue87%(146 flights)
  • Wed90%(152 flights)
  • Thu87%(165 flights)
  • Fri83%(167 flights)
  • Sat85%(159 flights)
  • Sun81%(167 flights)
On-time by departure window
  • 6–9 AM84%(204 flights)
  • 9 AM–12 PM93%(230 flights)
  • 12–3 PM90%(284 flights)
  • 3–6 PM59%(96 flights)
  • 6–9 PM85%(256 flights)
  • 9 PM–12 AM72%(53 flights)
On-time trend by month
87%
May

Jun 67% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202567%111
July 202571%123
August 202580%118
September 202592%91
October 202588%93
November 202593%89
December 202591%92
January 202686%86
February 202692%74
March 202689%79
April 202696%81
May 202687%86

Same trip, other airports

Keep nerding

Based on 1,129 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.